Estimation of Magnetic Interactions and Magnetic Structures in Charge-transfer Salts Based on [Cr(isoq)_2(NCS)_4]^- (isoq=Isoquinoline)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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Magnetic interactions J in [Cr (isoq)_2 (NCS)_4]^- -based charge-transfer salts, (BDH-TTP) [Cr (isoq)_2 (NCS)_4], (TMTTF) [Cr (isoq)_2 (NCS)_4], and (BO) [Cr (isoq)_2 (NCS)_4], are estimated on the basis of the extended Huckel molecular orbital calculations (BDH-TTP = 2,5-bis (1, 3-dithiolan-2-ylidene)-1, 3, 4, 6-tetrathiapentalene, BO = bis (ethylenedioxy) -tetrathiafulvalene, TMTTF = tetramethyltetrathiafulvalene, and isoq = isoquinoline) From this, experimental magnetic properties are discussed, and the magnetic structures are determined. (BDH-TTP) [Cr (isoq)_2 (NCS)_4] is composed of two-dimensional array of antiferromagnetically coupled ferrimagnetic chains These two-dimensional arrays, however, have net magnetic moment perpendicular to the sheets and give rise to weak ferromagnetism.(TMTTF) [Cr (isoq)_2 (NCS)_4] and (BO) [Cr (isoq)_2 (NCS)_4] have similar "body-centered" molecular arrangement. The TMTTF salt has considerable πd-interaction in two directions, and this compound actually shows a magnetic transition. The BO salt has large πd-interaction only in one direction, but the frustrating dd- and ππ-interactions are considerably large. Consequently, this compound does not exhibit a magnetic transition
- 一般社団法人日本物理学会の論文
- 2004-12-15
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関連論文
- Estimation of Magnetic Interactions and Magnetic Structures in Charge-transfer Salts Based on [Cr(isoq)_2(NCS)_4]^- (isoq=Isoquinoline)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
- Preface
- Estimation of Magnetic Interactions and Magnetic Structures in Charge-transfer Salts Based on [Cr(isoq)_2(NCS)_4]^- (isoq=Isoquinoline)(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)